Insole-heel-seat-trimming machine



T. LUND..

INSOLE HEEL SEAT TRIMMING MACHINE. APPLICATION FILED DEC. 1 3. 1918.

Patented Oct. 17, 1922.

/A/ l/E/V 747%. M M

Patented Oct. 17, 1922.

i 1 srmes THOMAS LUND, or BEVERLY, MASSACHUSETTS, ASSIGNOR TO UNITEDsnon MACHINERY CORPORATION, or PATERSON, NEW JERSEY, A CORPORATION OFNEW JERSEY.

INSOLE-HEEL-SEATTRIM1VIII TG MACHINE.

Application filed December 13, 1918. Serial No. 266,589.

one embodiment of the invention particularly designed to trim the edgeof an insole around the heel seat portion, for which purpose theinvention has features thatare especially adapted to meet the cond1tionsthat prevail when trimming an lnsole on a last prior to assembling ashoe upper therewith. The invention is not, however, limlted to thisspecial use, because it includes features that will be foundadvantageous in trimming soles other than insoles, and in trimmingportions other than the heel seat portion.

In the manufacture of welt shoes it has been the practice heretofore toattach an insole temporarily to a last with the toe end of the insoleeven with the toe end ofthe last, and when, as often happens, the insoleis longer than the last, to trim the excess material of the sole aroundthe edge of the heel seat portion. With a view tofacllltating andimproving this practice in particular, the present invention has beenembodied in a machine adapted to trim the heel seat portion of an insolemore or less closely to the contour of the last, and comprisingimprovements in construction that improve the operation.

One important feature of the inventlon consists in a rotary knife havinga circular cutting edge which is moved in the direction of its length toexecute a drawing out. One advantage of a drawing out is that itminimizes the degree of force necessary to feed the work which, inmachines for this purpose, is usually accomplished manually. Anotheradvantage of such a cut is that it avoids tearing the sole even thoughthe cutting edge be considerably dulled by wear. This permits longerperiods of service between sharpening operations and insures smoothcutting, particularly at the edges of the sole.

The knife may, and ordinarily would, remain in the work from beginningto end of an operation, and for this reason it steadies the work and, tosome extent, guides the latter. This form of knife, therefore, possessescharacteristics especially fitting it for use in a machine for trimmingthe edges of soles generally. For trimming the heel seat of an insole ithas a special advantage in that it can not form abrupt shoulders orcorners on the edge of the sole where the trimming begins and ends. Thisobjection arises frequently in machines that employ a trimming cutter ofthe type that executes successive chopping cuts each complete andindependent of the others. Various devices have been made to preventthe'formation of such shoulders because frequently they are so prominentas to form lumps at the sides of the upper of the finished shoe. Thisproblem is more fully set forth, for example, in Letters Patent of theUnited States No. 1,311,197, granted July 29, 1919, on application of H.D. WVebb.

A gage is provided to hold the last out of contact with the trimmingknife, and it is provided with a tongue arranged to extend between themargin of the sole and the last to sustain the margin out of contactwith the last and in the most desirable relation to the knife. This gageis preferably mounted so as to be adjustable to locate the line of cutmore or less closely to the edge of the last.

Another important object of the invention is to sustain the margin ofthe sole against the cutting stress of the knife without, however,offering any considerable frictional resistance to the feeding of thework relatively to the knife. For this purpose the invention includesasole-rest arranged to engage the bottom face of the sole, the main bodyof the rest being fixed, but being supplemented by an anti-frictionmember arranged to have rolling contact with the sole to minimize thefriction between the sole and the sole-rest. This anti-friction memberwould preferably be mounted in such manner as to enable it to yield sothat the sole may not lose too much of the benefit of the fixed elementof the sole rest. In consequence of providing the anti-friction memberas apart of the sole-rest, the sole is held against the last withsufficient pressure to prevent the sole from slipping edgewiserelatively to the last, and for this reason the tack that has heretoforebeen necessary to fasten the heel seat portion of the sole temporarilyto the heel seat'p'ortion of the last may be omitted. When theanti-friction member is in use the friction between the sole and thesole-rest is so slight in comparison to that between the sole and thelast that the sole follows the last instead of slipping relativelythereto.

The sole-rest and the tongue of the gage hereinbefore mentioned form,conjointly, a channel-to receive and guide the margin of the sole, andthe sole-rest is preferably mounted so as to be adjustable toward andfrom the'tongue to vary the width of the chlannel according to thethickness of the so e. i

For some purposes, as in the case of an insole,it is desirable to bevelthe edge of the solerather than to cut it squarely. For this purpose thesole-rest is arranged to present a fiat sole-sustaining surface ofconsiderable area, and said surface is arranged relatively to the knifeto insure a beveled cut when the bottom face of the sole is seatedthereon.

According to the embodiment illustrated the trimming knife is of annularform as distinguished from disk form, and the plane of the sole-rest istangential to a circle concentric to, but of less diameter than, thecutting edge, in order to produce the beveled cut above mentioned.

The invention includes, in addition to the foregoing features, otherdetails of construction and combinations of parts as more fully setforth in the following description, and particularly pointed out in theclaims.

In the accompanying drawings, which illustrate one embodiment of theinvention,

Fig. 1 is a view in side elevation of. a machine embodying the presentinvention;

; Fig. 2 is a sectional plan View, on the line 22, Fig. 1, showing theparts on a somewhat enlarged scale; and

r Fig- 3 is a perspective view of the knife, gage, and sole-rest, on alarger scale.

- The machine base 1 supports a bracket 2, which carries bearings for ashaft 1- upon which is mounted. a knife 6, which is herein illustratedas being hollow or cup-shaped having the general form of a truncatedcone and being provided at its base witha c011- tinuous annular andpreferably sinuous cutting edge 7 A belt 8 passes over idlers such as'that indicated at 10, and is driven to rotate-the knifeshaft 4: throughthe medium of apulley 12 on the latter. An arrow in Figure 2 indicatesthe preferred direction of rotation, although the latter may be reversedifthe available driving facilities are such that the reverse directionwould be more convenient.

of the knife when the last is positioned as shown in Figure 2. Thefunction of the gage 5 is todetermine how far, if at all, the insoleshall project'beyond the edge of the heel seat of the last after theexcess material has been trimmed, and it does this by holding the lastmore or less distant from the knife. The gage 5 is provided with atongue 9 which extends between the bottom of the last and the projectingedge portion of the insole 15 so as to position the last relatively tothe knife, and also to support the insole out of contact with the lastadjacent to the point of operation of the knife. 1

The bracket 2 is provided with another guideway 20 within which isarranged a projection from an adjustable slide 22 which is provided witha clamp screw 13. The slide 22 carries an angularly arranged gage 2awhich is adapted to support the bottom face of the heel seat portion ofthe insole on the last, and to co-operate with the gage 5 in positioningthe last relatively to the knife. A bracket 25 is affixed to the gage2tand supports a sliding bolt 26 which is provided with a yoke 27 carryinga pin upon which turns a roller 28. A spring 29 surrounds the bolt 26,is confined between the bracket 25 and the yoke, and acts to press theroller through an aperture 10 in the gage'24: and against the face ofthe insole, to press and hold the latter in engagement with the last.The outer end portion of the bolt 26 is provided withsuitable lock andstop nuts 30 for limiting the extent of the inward movement of theroller.

In the use of the machine,-power will be applied through the belt 8 torotate the lmife 6 at asuitable speed. An insole 15 having beenfastenedtemporarily to the bottom of a last, the last and insole are presentedto the machine with the toe pointing up. and the heel breast portion ofthe insole located between the tongue 9 and the face of the gage 24:.The projecting marginal portion of the insole will thus be braced beyondthe edge of the heel seat portion of the last, and the gage 5 will holdthe last out of engagement'with the knife and will so position the lastrelatively to the knife as to determine I against the last and hold itin position during the trimming operation. The last will be manipulatedby the operator so as to trim progressively along the edge of the insoleabout the heel seat, and the insole will be trimmed accurately to thecontour of the last around the entire heel seat portion thereof. Thework-engaging face of gage 24; is tangential to an arc rather thanradial to the axis of the knife, and the trimmed edge will be beveledaccordingly.

The sole-rest 24 and tongue 9 thus cooperate in guiding the insolerelatively to the knife and the gage 5 and tongue 9 cooperate in guidingthe last.

The tacks that are used to secure the insole to the last may be locatedin the shank and forepart, the roller 28 being suflicient to prevent theheel seat portion of the insole from slipping 'edgewise relatively tothe last, without requiring a tack in the heel seat. This has theadvantage that no tack comes into contact with the plate 24 on theroller.

The trimming knife is such that it can- 'not enter and leave the work soabruptly as to form shoulders on the sole, being in this respect a moredesirable knife than those of the chopping type heretofore used for thisoperation.

Having thus described my invention, what I- claim as new and desire tosecure by Letters Patent of the United States is:

1. A machine for trimming the heel-seat margin of an insole attached toa last, comprising a rotary knife having an endless annular cutting edgedirected to cut substantially at right angles to the direction ofmovement of its edge, and means arranged to engage the last and themarginal portion of the insole so as to guide them in a directionsubstantially at right angles to said cutting edge.

2. A machine for trimming the heel-seat margin of an insole attached toa last, comprisin a knife having an endless cutting edge directed to cutsubstantially at right angles to the direction of movement of its edge,and means arranged to engage the last and the marginal portion of theinsole so as to guide them in a direction substantially at right anglesto said cutting edge.

3. In a machine for trimming an insole attached to a last, thecombination with confronting sole-engaging abutments arranged to form achannel for the marginal portion of the sole and to engage the oppositefaces of said margin to brace it against flexure, of a rotary trimmingknife havin an annular cutting edge arranged to extend transversely ofsaid channel so as to cut in one direction regardless of the directionmeans for engaging the side of the last to position the latterrelatively to the knife, a work rest arranged to engage the heel seatportion of the insole, and a spring-pressed roll arranged to press theinsole against the last.

6. In a machine for trimming an insole attached to a last, a rotaryannular knife, means for positioning the work relatively to said knifecomprising a sole-rest arranged to engage the heel seat portion of theinsole, said sole-rest having an opening, a spring-pressed roll arrangedto occupy said opening tohold said insole in engagement with the last,and means arranged to engage the side of the last to position the workrelatively to the knife.

7. In a machine for trimming an insole attached to a last, a rotaryannular knife, means for positioning the last relatively to the knifeincluding a device to extend between the last bottom and the insole,said means being adjustable toward and from the axis of the knife, anadjustable solerest arranged to position the sole with its heel seatface parallel to the axis of said knife, and an anti-friction rollerarranged to bear on the insole to sustain the drag of the knife.

8. A machine for trimming a last-supported insole, comprising, incombination, a rotary annular knife, means arranged to engage the sideof the last to guide the latter relatively to the knife, said meansbeing adjustable toward and from the axis of the knife, and ananti-friction roller arranged to bear on the heel seat face of theinsole to sustain the latter against movement with the knife, saidroller being adjustable relatively to said last-guiding means.

In testimony whereof I have signed my name to this specification.

THONIAS LUND.

